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USB-C Charger diagnostics

Test what the browser can see. Know when it cannot.

Use manual power/profile calculations and device symptoms to check whether a charger is plausibly sized before verifying USB PD/PPS and manufacturer-specific fast-charge requirements.

Run these first

Relevant live checks

Charger Wattage MatchCompare a device's entered power requirement with a charger's rated wattage while keeping USB-PD/PPS and voltage-profile limits explicit.
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USB Voltage Current to Watts CalculatorCalculate watts from an entered USB or charger voltage/current profile.
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First diagnostic sequence

Do the high-signal checks before risky changes

  1. 1

    Use the device manufacturer's required/recommended charger profile

  2. 2

    Check the cable rating separately

  3. 3

    Compare another known-good compliant charger/cable before blaming the device

What DeviceOK/browser can help check
  • Calculate entered voltage/current/wattage relationships
  • Compare entered charger and device power ratings
What this browser page cannot prove
  • Read charger PD/PPS profiles through an ordinary webpage
  • Verify cable e-marker or electrical safety
  • Prove a charger is certified or safe